At present, most of the IP instrument acquisition systems are placed on the ground, which will result in low resolution of potential changes at different depths underground. Aiming at the limitations of the IP instrument's deep well detection, a array type acquisition system of logging IP instrument was proposed. The system uses a high-precision digital-to-analog converter—ADS1282, an array type downhole devices and efficient communication. The feasibility and reliability of the acquisition system were studied through the 5000m long cable simulation of the instrument and the actual downhole experiment. The results show that the system can achieve the breakthrough of the IP method acquisition system from the surface to the well (deep well)，and can meet needs of In-hole IP exploration.